Not loading key maps by default

I am running ISBoxer with rift and have set up various key maps for different roles. Then I want to enable maps on a per-window basis (usually, some I like to have loaded in all sessions) but because of conflicts I have to disable all of them first. In many cases the hotkeys for different roles (in different sessions) conflict, so I wish to NOT load any of the role based keymaps by default - but I can't find a way of doing this. If I remove the a mapped keys set from a character set, it is never loaded and therefore can't be activated. I'd prefer to load them but not have them active by default.

I've done the usual and defined a "reset" mapped key to turn them all off, but I'd like that to be the default. I've read the Wiki & FAQs and done forum searches here and elsewhere (all of which suggest that when loaded they are enabled by default regardless) but wondering if I've missed something somewhere which can load them in the disabled state by default.